Water Absorption and Water Vapor Permeation of Polyester/ Beta-Hydroxyalkylamide Powder Coatings
Fall 2002 Vol. 4, No. 2
The applications described above all require excellent resistance to corrosive environments. Water absorption and water vapor permeation are two important factors when assessing the
corrosion resistance of a coating. Since ß-HAA based powder coatings are commonly used for applications that require long-term warranties on gloss retention and chalking, it was important
to characterize the permeation properties of these systems. An independent study was initiated by EMS Primid to evaluate the moisture absorption of polyester/ß-HAA powder coatings. The
study was carried out by the Research Institute for Pigments and Coatings in Stuttgart, Germany. A polyester/TGIC formulation was selected as a control formulation.